Preparation of Platinum/Carbon Aerogel Nanocomposites Using a Supercritical Deposition Method
Preparation of Platinum/Carbon Aerogel Nanocomposites Using a Supercritical Deposition Method
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DOI：
10.1021/jp049535v
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发表时间：
2004-05
影响因子：
3.3
通讯作者：
Carl D. Saquing;T. Cheng;M. Aindow;C. Erkey
中科院分区：
文献类型：
--
作者：
Carl D. Saquing;T. Cheng;M. Aindow;C. Erkey
Platinum/carbon aerogel (Pt/CA) nanocomposites were synthesized using a supercritical deposition method. Dimethyl(1,5-cyclooctadiene)platinum (II) (CODPtMe2) was dissolved in supercritical CO2 (scCO2) and impregnated into porous organic and carbon aerogels. The impregnated aerogels were converted to Pt/CA composites by heat treatment ranging from 300 to 1000 °C in the presence of nitrogen gas. Both conventional and high-resolution TEM micrographs showed a good distribution of fairly monodisperse Pt particles throughout the bulk of all the aerogel supports used. The nature and crystallinity of the particles were confirmed using XRD. Increasing the reduction temperature increased both the crystal size and the polydispersity. Crystallite sizes as small as 1 nm were obtained at low reduction temperatures and the particles were single-crystalline. Particle sizes obtained from H2 and CO chemisorption measurements are consistent with those measured from TEM images, indicating the accessibility of the surface of ...
